Yes, a prostate orgasm is much different and they are AWESOME! They say it's like comparing the difference between a clitoral and a vaginal orgasm. I've had multiple orgasms and some lasting up to 10 minutes long. You will have one happy guy!

Yes, a while ago when playing with a large buttplug, my dick went automatically so hard (without any pysical contact) that I couldn't stop my orgasm.......I tried not to cum, in which I didnt succeed, which made it even more powerfull

It's possible to have a n orgasm from prostate massage. The pure anal and prostate stimulation is enhancing the male orgasm and prolongs it more or less. There is also a possibility to have quite intense non ejaculatory orgasms just from anal stimulation; however training is required and it seems that not all can achieve it.

There are a few good "training devices" and the Aneros Helix is one of them (basically the whole Aneros line is designed for that purpose). They come with manuals and techniques on how to achieve this mysterious super "O". To be honest I haven't been able to achieve it using the Aneros toys, but it gave me an Idea on how to work on it and the first toy that actually made it possible was the Blush UR3 ballsy dong. To be honest it's amazing and you can have multiple mind blowing orgasms without ejaculation.

Stimulation of the prostate is usually leading to an intense orgasm and toys like the Billy are specifically designed for that purpose. Maybe but only maybe you can compare it with clitoral VS vaginal orgasms of a woman. But being a man it's really hard to compare those things.

Another interesting part is the stimulation of the prostate during the intercourse while having a butt plug inserted. The Ryder does the job very well The erection is usually much harder and the orgasms are more intense.

Prostate orgasms can be great, but if there's a lot of pressure then they probably won't happen (and might not happen anyway). Start out with both penile and prostate stimulation, then back off on the penis until you're ready to go for the O, then do both again. Feels great.